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<ol>
<li><a href="http://guangningbo.gitee.io/day2/作业1.html">练习一</a></li>
<li><a href="http://guangningbo.gitee.io/day2/作业2.html">练习二</a></li>
<li><a href="http://guangningbo.gitee.io/day2/作业3.html">练习三</a></li>
<li><a href="http://guangningbo.gitee.io/day2/作业4.html">练习四</a></li>
</ol>